Commercial Roofing for Pasadena Businesses and Properties
Warehouses, shops, offices and multifamily buildings all depend on a roof that drains and seals. This page covers what owners and managers should watch in Pasadena.
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Where commercial roofs fail first
Seams
Membrane seams open as the roof expands in heat and shrinks at night. Older seams lose adhesion first.
Drains and scuppers
Leaves and debris block them, and water ponds on the surface.
Rooftop equipment
Curbs around HVAC units and vents are common leak points.
Edges and parapets
Wind pulls at perimeter metal and flashing, especially during strong storms. Once the edge lifts, wind can get under the membrane and peel it further.
Storm exposure in Pasadena
NOAA's Storm Prediction Center logged 28 hail reports within 10 miles of Pasadena from 2015 through 2024, and 7 of them were 1.75 inches. Large hail fell in 2019, 2023 and 2024. On a low-slope roof, hail of that size can bruise membranes, crack older coatings and dent metal panels. The insulation below can be crushed even when the surface looks fine. Water that gets through a small puncture spreads under the membrane and can soak a wide area before a stain shows inside. That is why commercial roofs are checked on top and, when needed, below the surface.
Location matters for coverage. Pasadena is mainly in Harris County, and only the part east of State Highway 146 lies in the TWIA catastrophe area. If the building there carries TWIA coverage, roof work generally needs windstorm inspection and a WPI-8 certificate from the Texas Department of Insurance.
Low-slope systems you will hear about
TPO: a white or light single-ply membrane with welded seams.
EPDM: a rubber membrane that stays flexible in heat and cold. See TPO vs. EPDM roofing.
Modified bitumen: torch-down or self-adhered asphalt sheets in layers.
Built-up roofing: alternating layers of asphalt and felt, common on older buildings.
Metal: standing seam panels on low slopes, often seen on shops and warehouses.
Each one ages differently in Texas heat, so the inspection method changes with the system.
Each has trade-offs in cost, life span and repair method. The right one depends on the building.
Coatings are also sold to restore some aged roofs. Whether one makes sense depends on how wet and worn the existing system is.
A maintenance routine that prevents surprises
Twice-a-year walk
Check drains, seams and flashing in spring and fall.
After every major storm
Look for punctures, displaced metal and debris. Check inside for new ceiling stains as well.
Keep a log
Note dates, photos and repairs. A log also shows a buyer or lender that the roof has been cared for. It helps with budgeting and with any claim.
Fix small issues fast
A small open seam is a quick repair. The wet insulation it causes is not. Our commercial roof maintenance plan has a template.
GemSco on commercial jobs
GemSco handles residential and commercial roofing, including low-slope and flat roofs, with 20+ years of experience. We inspect, document with photos and give you a written estimate. To keep tenants and customers working while the roof is repaired, see how to reduce business disruption during roof repairs.
Learn more on our commercial roofing page or visit roofing in Pasadena. Estimates are free.
Frequently Asked Questions
How do I know if my flat roof has hail damage?
Look for dents on rooftop units, vents and metal edges first. On the membrane, hail can leave bruises, small cracks or punctures that are hard to see. Core samples or close inspection may be needed to check whether the insulation below was crushed or got wet.
Should I repair or replace an aging commercial roof?
If the membrane is mostly sound and the insulation is dry, targeted repairs can extend its life. If large areas hold water, leaks keep appearing in new spots or the insulation is wet, replacement is usually more cost-effective. Read signs a commercial roof needs replacement.
Does TWIA apply to my Pasadena building?
Only if the building is in the part of Pasadena east of State Highway 146 and carries TWIA coverage. The rest of the city is outside the TWIA catastrophe area. Your insurance agent can confirm where your property falls.
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